Andrew Cuomo won't be at Charlie Rangel's birthday party

Governor Andrew Cuomo won't be attending Charlie Rangel's big birthday party tonight, according to a spokesman for the governor.

At a press conference announcing the endorsement of Christine Quinn this afternoon, Rangel said he assumed the governor had endorsed him, but wasn't entirely sure.

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Josh Vlasto, a spokesman for Cuomo, told me this afternoon that the governor won't be issuing any endorsements, in any races, until after the legislative session has concluded.

Rangel's birthday party regularly attracts some of the biggest names in New York politics, and, in recent years, has served as an unofficial barometer for the congressman's institutional support.

Cuomo attended the event in 2010, when Rangel was near the high-water mark of his ethical troubles, and was chased through a subway exit by some aides to his then-opponent, Rick Lazio, whose campaign produced a video noting the governor's attendance.

Vlasto said the governor is unable to attend tonight because of a family obligation.

UPDATE: Rangel's campaign spokeswoman Ronnie Sykes emails, "The Gov's camp was in touch with our campaign and up until the last minute he was hoping to attend, unfortunately because they are in session and due to the travel time between Albany and New York, the Gov. informed us that he would be unable to arrive in time."